G0 Accelerator Planning Meeting (11/1/05) Agenda: 1. Introduction & Proposed Beam Specifications (Grames/Pitt/Suleiman - 15 min) 2. Proposed Accelerator Configuration [non-parity quality concerns] (Freyberger- 10 min) 3. Polarized Source Setup [parity quality concerns] (Poelker/Suleiman - 10 min) 4. Injector Matching [parity quality concerns] (Chao - 10 min) 5. Engineering Issues (Merz/Lauze - 10 min) 6. Software Issues (Bickley/Roblin- 10 min)

What is new for backward angle? 499 MHz vs. 32 MHz 80 uA (100 uA) vs. 40 uA Lower energy 687 MeV & 360 MeV (vs. 3 GeV) Superlattice (85%) vs. Strained (75%) photocathodes Ti:Sap & Fiber laser options PQB specs reduced ~2x <-> Asymmetries larger ~10x PQB dominated by source setup and injector matching G0 spectrometer reversed

Scheduling (intended accelerator schedule, but not yet firm) Pre G0 Run Accelerator down January-February 5 G0 laser table setup G0 injector matching setup CASA G0 1-pass G0 setup Hall B, then Hall A (using Hall C laser) run period 2/6-3/13 Hall C nominally down until 3/14 Best estimate for early beam delivery for checkout 3/1 First Run Period (687 MeV, 1 pass, high Q2 measurement) G0 accelerator commissioning 3/15 & 3/16 G0 physics commissioning 3/17-4/2 (3 polarized expt’s) G0 physics production run 4/7-5/1 (2 & 3 polarized expt’s) Second Run Period (360 MeV, 1 pass, low Q2 measurement) ~2 weeks later, start w/ ~2 days accelerator commissioning Special accelerator setup, G0 run only 5/16-8/1 Third (and final) Run Period (687 MeV, 1 pass, high Q2 measurement) Begin ~9/22-12/22 (3 experiments)

Parity Quality Beam Specs Property Nominal Deviation (slow) Helicity “noise” (2) 1/30th Other “noise” e.g. 60 Hz Run Averaged (3) Forward Specified Forward Achieved Energy (1) 687, 360 MeV ±0.1% 0.003% (105um) 0.01% (350 um) <5x10-8 (180 nm) <75 eV 29 ± 4 eV Energy Spread <0.1% CW Intensity 80 mA (100 uA) ± 5% 0.2% 1.0% <2 ppm <1 ppm -0.14 ± 0.32 ppm Position at Target “0” ± 0.2 mm 20 mm 0.2 mm <40 nm <20 nm 4 ± 4 nm Angle at Target ± 0.05 mrad 2 mrad 0.02 mrad <4 nrad <2 nrad 1.5 ± 1 nrad Divergence at Target 100 mrad ± 50% Unrastered RMS Size at Target 200 mm ± 25% 4 mm ? Polarization >70% Halo at Target <10-6 outside 3 mm radius <0.2% of nominal Dispersion at 3C12 35 mm/% and <1 mm/% at target. Standard deviation of difference between adjacent samples (each 1/30th) E.G, number of pairs in run, N = 15 per sec * 3600 sec/hr * 700 hr = 37.8 Msamples, and 20 mm/Sqrt(N) ~ 3 nm

G0 Diagnostics Girder

G0 Halo Girder